39 years of marriage, 20-something moves, 4 provinces, 4 countries, don't actually remember how many moving companies. If you are packing yourself, this is a good time to destash. Think about the weight of a single item in a box--books are heavy, china is better in small boxes.
Think of your car as if you were evacuating. Important papers, money, jewellery, medications, computers, pets plus supplies, and special non replaceable items should go there. Make a list of important phone numbers and put it in your wallet (or on your iphone--sorry I'm still old-school)
If you have time, start using as much as possible from your freezer. Make sure that the freezer is the last thing on the truck and the first thing off--and plugged in right away. Frozen food will stay frozen quite a while if insulated with a few quilts. So pack it last and replace it first.
Think of the time that you will be without your household goods. If it is only a matter of a few hours or a day or two, that is survivable. But if it is a week or so, start writing down what you need/use every day. And don't forget about the things that your kids just cannot 'survive' without--whether it is a scruffy stuffed toy or a hi-tech game, keeping them happy will definitely make the move easier.
(((HUGS))) bin there done that more times than I wanted to.